Two Frontier Corps personnel and a civilian were injured in a roadside blast in Chaman's Boghra Karez area on Tuesday.
FC sources said the bomb, planted under a bridge, was intended for a passing FC vehicle.
All three wounded have retained non-critical injuries, the sources said.
Last month, on January 2, at least four security personnel and two civilians were injured in a blast in Quetta's Western Bypass area.
The Frontier Corps (FC) personnel were on a routine patrol when their vehicle was targeted through a bomb planted on the roadside.
In November last year, three FC officials were killed and seven others were injured in a roadside improvised explosive device (IED) blast which occurred near their vehicle in Peshawar's Bashirabad area.
The number of attacks in the country has fallen around 70 per cent, due to a combination of the military offensive against Taliban bases along the Afghan border and government initiatives to tackle militancy, but attacks on security and civilian targets continue to occur occasionally.
